Method for removing scratches from celluloid motion picture negative and positive films



Feb. 2, 1937. A M 2,069,501

7'0 DRYER METHOD FOR REMOVING SCRATCHES FROM CELLULOID MOTION PICTURE NEGATIVE AND POSITIVE FILMS Filed Jan. 5, 1934 WLM 5' I firzhur M Z 1/ INVENTOR ATTORNEY Patented Feb. 2, 1937 UNITED STATES.

PATENT OFFICE METHOD FOR REMOVING SCRA'ICIIES FROM CELLULOID MOTION PICTURE NEGATIVE AND POSITIVE FILMS Arthur J. Miller, Tenn-fly, N. 1., am... to Cinema Patents Company, Inc., New York, N. Y;., a corporation of New York Application January 5, 1934, Serial No. 705,345

2 Claim.

10 net supplied with clean filtered air.

The drawing, Fig. 1, illustrates schematically the means used for applying the solvent and the lacquer.

The solvent is applied by means of a polished 15 wheel I, which dips into the solution 2 and in rotating transfers the solvent to the film. This wheel is externally driven at film speed. Guide rolls 3, 4 and 5 may advantageously be placed in the illustrated positions relative to the'brass wheel I.

The film then passes to a second device, substantially identical to the first, in which the lacquer is applied in the same manner. The lacquer-applylng device is provided with av camel's The apparatus illustrated is suggested, but any other means of treating the film with the agents and in the mannerdescribed may be employed.

As used here the solvent roller is sufficiently wide to cover the entire picture area and extend into the perforation area slightly.

The roller which applies the lacquer is of the correct width and disposition to exactly fill the area between perforations.

hair brush 6, over which the treated surface of The following have been found to be emcient solvents: cello-solve, methyl-cello-solve and cello-solve acetate. Cello solve is ethylene glycol monoethyl ether; methyl cellosolve is ethylene glycol monomethyl ether; and cellosolve acetate is ethylene glycol monoethyl acetate.

- I find that a superior result is obtained and the film made more glossy by using a solvent of the following mixture: cello-solve acetate, 4

.parts; butyl cello-solve, 1 part; pure camphor 1o dissolved to saturation. Butyl cellosolve is ethylene glycol monobutyl ether.

Other nitrocellulose solvents have been found to be useful varying in efficiency.

Of several lacquers which may be employed, Eastman Kodalak W. P. is most successful, although Eastman Silverdlp lacquer, properly diluted, may be successfully used. with some film it is necessary to add a little camphor to the lacquer.

The names used to describe the foregoing solvents and lacquers are tradenames or descriptive names known in the art andneed not be analyzed here. Such products have, however, always beenused in other ways than as described in connection with my invention."

I claim:

1. The method of removing scratches from the celluloid surface of a photographic film, which comprises the steps of, applying a solvent for said film to said surface to soften the same, thereafter applying a lacquer to said surface before said surface has hardened and then drying said film.

2. The method of removing scratches from the celluloid surface of photographic film, which comprises the steps of, applying a solvent for said film to said surface, maintaining said solvent on said surface until the same has been softened, applying a nitrocellulose lacquer to said m surface before said surface has hardened and then drying ,said film.

ARTHUR 

